Breast Cancer Referral

Hi,

My underarm began swelling on my left side, over a month ago and have had shooting pains in the left breast on and off. I thought it was in my head and thought nothing of it. Then before Christmas it started to get a bit tender, where the swelling is and thought it was time to get it checked out. I spoke to my GP yesterday, they examined me and have referred me for a 2 week wait. 
 

I know it was only yesterday, but how long should I wait for the appointment to come through,  a week? the full 2 weeks?

What can I expect for the first appointment, will it take a few hours? Would I need the full day off work?

I'm soo worried about my family and what happens if I can't help to support them, as a mum and a wife. I know I am jumping to conclusions and it is most likely nothing, more a precaution, but I just don't know how I am going to keep distracted until I've been seen.